RIP, Harvey Pekar: Why His Letterman Performance Was Great

The man's career is difficult to sum up, especially if you haven't seen American Splendor. But this 1987 performance on David Letterman's show gives a taste, not to mention that it demonstrates just how far the Letterman show has changed.

Some reasons why the clip is great:

1. Well, the t-shirt saying he's on strike against NBC, for starters.

2. His catching the Vaughn Monroe reference in terms of his voice and riffing off it.